问题
单项选择题
A boy walking along a road at 3 kilometers per hour is overtaken by 3 truck traveling at 40 kilometers per hour. If the truck breaks down 1 kilometer beyond where it passes the boy, how many minutes after the breakdown does the boy reach the truck ?()
A.A
B.B
C.C
D.D
E.E
答案
参考答案:E
解析:
设该男孩行走1公里所用的时间为分钟,而货车行驶1公里所用的时间为
分钟,所以该男孩在故障发生后到达现场所用的时间为
。